From the NetBSD Blog: "The fourth (failing further faults, final) release candidate of NetBSD 5.1 is now available for download. Those of you who prefer to build from source can continue to follow the netbsd-5 branch, but the netbsd-5-1-RC4 tag is available as well. See src/doc/CHANGES-5.1 for the list of changes from RC3 to RC4."